Question

what is exothermic change

Answer 1

An exothermic reaction is a chemical reaction that releases energy by light or heat. It is the opposite of an endothermic reaction.

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Answer 2

Exothermic change (exothermic reaction):-

Reactions in which heat is given out along with the products are called exothermic reactions.

For example:

Burning of methane gas releases a large amount of energy. Hence it is an exothermic reaction. 

CH4 (g) + 2O2 (g) → CO2 (g) + 2H2O (g)